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SCIENCE

The Claim

A hook echo on weather radar indicates that a storm cell is going to form.

Verified by Lenz ·

The Short Version

The evidence shows the claim reverses what a hook echo means. A hook echo is a radar signature within an already formed, rotating thunderstorm—typically a supercell—not a sign that a storm cell is about to form. It is mainly associated with mesocyclone structure and possible tornado development in an existing storm.

Caveats

  • Do not confuse storm-cell formation with tornado development; a hook echo relates to the latter within an existing storm.
  • Hook echoes are reflectivity signatures on radar, not a general early-warning signal for new storm initiation.
  • Less reliable social-media and informal sources often simplify this point and can blur the timing of when a hook echo appears.

The Receipts

  1. Glossary - NOAA's National Weather Service

    NOAA National Weather Service

  2. Severe Weather 101: Tornado Detection

    NOAA National Severe Storms Laboratory

  3. Hook echo

    Wikipedia

  4. Supercell Radar Signatures

    University of Oklahoma

  5. Radar Signatures for Severe Convective Weather: Hook Echo

    Luther College

  6. A pioneer in tracking tornadoes by radar

    Illinois State Water Survey / University of Illinois

  7. Weather Radar Signatures: Echo, Debris Ball

    RainViewer Blog

  8. what causes a hook echo on radar? and why does it look like that

    Reddit r/meteorology

  9. Hook Echoes: When Radar Lies (And How to Know)

    YouTube – meteorologist educational channel

  10. What The Heck Is A Hook Echo?

    INStormChasers (Facebook video)

+ 2 more sources — see the full list on Lenz

Filed Under

Hook EchoWeather Radar

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